Yeah - this. Invest in good Focus Pullers!!
So it sits underneath the lens... And what - gets calibrated as to how far away from the film plane it's sitting? Or you just have to make sure it's mounted precisely each time...
And it tracks what it sees - which are bodies, generally, at that height - not faces. So - it's a mostly imprecise way to get a ballpark focus for $2-5k.
I don't see what's so gamechanging.
Won't happen. It's clear Canon's SLR line is first and foremost for photographers.
If you want to shoot video, you're either an enthusiast, in which case you're using a cheap camera, or you're a professional, in which case they believe you should be using on of their Cine EOS line cameras.
Sony, on the other hand, have a cinema line as well as their SLR line, and they complement each other well. They have a video camera at every price point in the market.
Are you covering flights and accom? ;)
It may be worth it, I'd personally get a 3-4 kit of fresnels. Depends on your situation though and the work you're doing. As a one man band, it can help, but you need to weigh up whether the work you're doing is enough and pays enough to justify the purchase, especially over renting.
A demo reel as a Producer is totally unnecessary and can actually hurt you as it may seem like you have no idea what your job really is.
To me, it's kinda like an AC having a demo reel - completely superfluous and tells me nothing about whether they are any good.
You need a good resume and good referees. Your effectiveness as a Producer will be what gets you work, not a demo reel.